The following table compares the ATD Manure Treatment System with two commonly used manure treatment systems: anaerobic digesters and composting.
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ATD SystemAnaerobic DigestersCompostingManure FlowBarn to Plant to Pellet storage with liquids recycled to Barn.Barn to Digester to Lagoon to land unless full treatment systems are added to separate and dry
solids for pellets and treat water for recycling.Barn to separator with liquids to lagoon and land and solids to mixer for addition of carbon and structure then to land. Process Time1 day.Must be designed for
digester residence time of many days, additional treatment would be sized accordingly. Otherwise lagoons subject to annual pumpout.Solids will take 45
to 60 days depending on management and weather.^
Water Consumption2.1 Litres per day per place.22.1 Litres per day per place (assuming 2.7% solids in pumpout) or for 10,000 places, 150,000
Litres per day.22.1 Litres per day per place (assuming 2.7% solids in pumpout) or for 10,000 places, 150,000
Litres per day.^ topOdoursOff floor evaporation
only remaining source. Eliminates Hydrogen Sulfide and Ammonia.Somewhat reduced.Somewhat reduced if managed intensively.^ top ATD SystemAnaerobic DigestersCompostingGreenhouse GasesReduced by over 65%.Methane burning reduces
greenhouse gas release.Active management can
reduce ammonia release from solids.^ topDisposal AcreageAs surplus pellets can
be sold off-site the opportunity for re-balancing nutrients to available
land can be achieved with the least disruption. As regulators focus
on these issues, the ability to export any surplus will allow new
choices to be made. It is now possible to expand to obtain economies
of scale on the same land base.Unless additional treatment
is installed the equations remain the same.No change.^ topNutrient ManagementN losses as high as 75%
can be eliminated. Phosphorus is all in the pellet. Surplus nutrients
can be sold off-site as a dry, pathogen free pellet with consistent
analysis.Methane burning in itself
has no effect on N,P,K. Inconsistent and lower nutrient levels continue
with lagoon pumpouts. Surplus nutrients will still require additional
treatment.The more volatile nutrients
are stabilized in the solids and the liquids retain dissolved nutrients
as before.^ topValue Added ByproductSurplus nutrients in
pellets, greenhouse gas reductions.Electricity Greenhouse
gas reductions.Surplus compost.^ top ATD SystemAnaerobic DigestersCompostingPathogens,WeedseedBoth liquids and solids
are pathogen free and weed seeds are infertile.No change unless additional
treatment is added.Liquids are untreated
and a well managed compost with sufficient heat will kill the weed
seeds.^ topSite RequirementsA building 100′ by 50′
located somewhere along the present route to the lagoon would allow
new plumbing arrangements to be made conveniently. Three phase power
and reliable telecommunications will be needed. This is a chemical/mechanical
process having no biological treatment component affected by weather.
It is computer assisted and remotely monitored to ensure trouble free
operation. Certificates are not required by staff for operation.The digester should
be located between the barns and the existing lagoon if possible.
Connections will be needed to the power grid. Heat losses over the
winter months are a consideration. If additional processing is added
to close the loop on water quality and dried pellets then the site
should be large enough to take these additions at some point.The compost piles may
need cover and will need sufficient room for 60 days retention. A
pad may be required for leachate control.^ topBottom LineThe effect on costs will
be the difference between current expenditures and new system expenditures.
ATD offers to review these with potential clients to determine the
benefits before commitments are made.It would appear that
the costs of the digester and generating equipment less the power
savings, power sales and heat consumption must be isolated as a separate
issue. The issues of the lagoons, odour and nutrient balance remain
until additional treatments are added.Compost holds more water
than pellets and thus adds to hauling costs when exported. The nutrient
levels may not be consistent and the market for the product may be
elusive.^ top